Not Good Enough

So my husband and have been together for 16 years. I know peoples body change as they get older. I have lost weight, gained weight, and lost weight. I am trying to get in with a doctor to see if I have problems with my thyroid. The last three years has been very hard, because my husband would rather watch porn or get on chatlines to talk to other woman to get off. I can't tell you the last time him and I have had sex. We may try once a year and neither of us gets up. Right now I'm at the highest weight I have ever been. I have tried to lose weight, I've tried diets, may lose 5 to 10 pounds and then it comes right back. I don't feel attractive, he's even told me at times I'm not attractive anymore, and its devastating, due to I want to please my husband and me. Any suggestions?