Weight gain?

I think this is the right place to post this. I'm a heavy person before I got pregnant with my daughter I weighed 260 after having her I weighed 290 dropped to 275 while breastfeeding then gained back 15 + pounds where I've stayed at a steady 293 for over a year. Recently I got down to 289 then all of a sudden this past week - I gained 10 pounds out of no where. What is going on with me?! This makes me hate myself even more and constantly hate my body. I've been repeatedly told I don't have a thyroid issue by my doctor but I think that I do since it runs in my family.