Can somone please help me? My husband is lying, scheming behind my back!

My husband has dementia, in assisted living, believes there's nothing wrong with him. He contacted an attorney to have me revoked as P.O.A. and appoint his brother as P.O.A. "for 24 hrs. and then he would be his own P.O.A." I have never heard of a "24 hr P.O.A. or being your own P.O.A." ????????????? After several discussions, talking with me, my attonrey and a hefty bill, the attorney told my husband it is in his best interest that I remain the P.O.A., and it would not make sense for his brother to be the P.O.A, since there has been no interaction between my husband and the bro., so the bro could hardly convince a judge that he could be the P.O.A. and the judge would not assign someone to be his P.O.A. knowing they would let him move out and be on his own in his condition, and the attorney told him there is nothing more he can do for him.

Now the brother and his wife (who has never gotten along with my husband (she and my husband actually have hated each other for many, many years) for the past several weeks have gone out of their way to spend many days each week with him, taking him out to eat or to their house, etc. Now, behind my back, from info that has been relayed to me from A.L., my husband was on the phone and said he "will need a tv and a table" and "and pick me up after lunch". The person he was talking to was his sister-in-law. I'm wondering if she's taking him to look at an apartment. I arrived (unexpectedly) right after lunch; at that time he got a call from his sister-in-law, told her she had the wrong #. I stayed for 3 hours. After the first hour, he said he had to go to the bathroom and behind my back called
SIL(that he hates) and said "she's still here, I'll call you when she leaves." I left after 3 hours and 15 min later he called her. Have no idea what was discussed. I know he has an appointment with another doc, (I need to take him to the doc, but he kept this appointment from me) he has no idea I know that, he's doing it behind my back. The appointment is routine, but he also requested to see a social worker and requested testing be done, since he believes there is nothing wrong with him, wants P.O.A. removed and wants to move out of AL.

My husband has turned his entire family against me and he is constantly plotting against me, while at the same time, I'm giving him spending money every week and doing anything I can for him and taking him anything he wants me to take to him, tells me he loves me, always wants to know when I'll be back. I'm there 3 or 4 times a week. I planned to be there on a weekend, his son was here from out of town, I planned to be there then and he told me not to come over until the next day (when he son would be gone).

He's been very pleasant to me recently, I suspected he was up to something; he has always been very dishonest, but now it's worse. I can't trust him. He's very good at making people believe there's absolutely nothing wrong with him. Can he fool a social worker or a doctor? I have documentation from his family doc who has known him for 25 years, stating he has dementia, cannot handle legal or financial matters. Should I sent that documentation to this other doctor before his appointment?

I have retained an attorney, but at this time, don't know if there is anything he can do for me, since this is all the info I have.

Would it be appropriate to have my attorney contact the bro and SIL, or would that just add fuel to the fire?

Don't know how much more I can take. I'm in tears all the time (my husband does not know this) and I don't sleep, I hate to get out of bed in the morning.

I told him I'd take him out to eat for thanksgiving and to a movie. He wants to eat and come back to our house to "watch tv"; I'm afraid I wouldn't be able to get him back to A.L. There'd be no one to help me since my family will be out of town that day. I was invited, but declined, I didn't think that would be fair to my husband.
I can't let my husband know I'm aware of all this, since he has no idea I have access to his call log on his phone and I've been given this info in confidence from A.L.

Please, please help, I'm at my wits end !!!!!!!!!!!