What happened & why am I gaining Weight & cant loose it?

im 33 yrs old, 5ft 3 in tall i weigh 190 pounds ive never weighed this!!!! i had a hysterectomy 7yrs ago and it seems i keep gaining weight im trying to lose but getting nowhere any suggestions?? And if I get some off it comes right back. I started off at 110 pounds and went up from there. I walk daily and ride bikes with my kids. I love playing sports with them , dancing, jumping on trampoline and swimming , so I do exercie . I try not to eat alot fo sweets or junk since I'm diabetic also. I dotn drink cokes, or eat alot fo fried foods. Any suggestions would be great. Thank