Sharp pain in back of legs and arms for 2 years now. lasts 5-10 mins then moves to a different spot. worried about blood clots? have had dietary problems for 2 years as well. 21m, 66 290lbs 33 bmi?

We need more details. You are concerned for clots, that often come with swelling and pain of the arm and leg. You mention dietary problems. See a doctor in person, for a complete evaluation

Your obesity is likely responsible for your health issues, including the concern about blood clots. Losing weight is imperative, not easy, but essential. Joining a support group like Weight Watchers may help. Exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/.