Yeah it is a little werd but maybe you could think of it in another way. Just like stated above since he is older he might enjo the company and needs the help around the house. and since it really isnt him "working" he is not bound by law to make you tell your parents or anything like that. So it is possible that he understands the situation that you are in and wants to work with you. He sees that you want the help and since it used to be his profession, it is something that he probably still enjoys.. helping people. I am not sure what your possible illness's are but he wont be able to prescribe you any medication I dont believe. So maybe you could just try it all out and see if it is worth it, and see if the weirdness feeling goes away. If it doesnt then you can say that you did try it, and maybe try to find another way.

It is great that you are getting help. I hope that everything works out for you.

Take Care and Good Luck
xx Blue Eyes