Not all ladies have a Gspot. Some ladies don't orgasam through penetration. Have you tried clitoral stimulation? Also exercise and eat right is good for you that isn't going to fix a hormonal imbalance. Also you sound extremely stressed out about your situation (which is understandable) but that isn't going to help. With all the thoughts going on in your head there's no way you can enjoy yourself. I do suggest some private time by yourself to learn your body, it couldn't hurt. I hope you find something that helps...
Might want to check on the possibility of hormone imbalance. I don't think it would hurt anything to just check... Hopefully that will resolve your issue
Do you take any birth control? I was on the shot, and I did not feel any pleasure during sex after I had my daughter. I switched to the Mirena and I do not have that problem now!
I wanted to reach out to you to let you know that I am praying for you. Right now this is the only solution that I can personally offer you. Keep us posted on how you are doing. God bless.