Explaining myself to people who really don't intend on listening to what I am saying about my illness exhausts me to no end. Speaking on the phone exhausts me. I've become a rather quiet person over the years. No one wants to truly listen, so I've given up I guess.

I can see how learning new languages would be exhausting as well. If its your passion tho, I would keep working thru it. I find it intriguing that you have this passion . Not too many people venture outside their own culture to learn new ones or languages. I think it is healthy for you to do. If it exhausts you, perhaps that could be a que to slow down a little bit and learn at a pace that fits your comfort zone so it doesn't become overwhelming.