I Am Gaining A Unsual Amount Of Weight In A

I am gaining a unsual amount of weight in a short time. I am overweight but i am feeling like i am gaining more weight then usual i am bloated my buttocks and thighs are getting bigger. I have not been doing anything much different i have been doing some on the tread mill and eating lighter seems as though i am still going in the wrong directions. for the las two weeks i have had constant pain in my thighs when i get up and start walking. i am a pre diabetic but my numbers have been good. i take medicine for high blood pressure i was a smoker it has been two months since i stopped smoking. i was told i need to take vitamin D along with some other vitamins. not sure what to use or do for the pain in my thighs . i sit at work alot i try to get up more but sometimes i get very busy working on my computer but when i do get up i am in pain feel like i am 100 years old