Thanks for writing in.
The symptoms that you are describing are not suggestive of sciatica
but rather appear to be due to exercise. Hot fomentation and Volini
spray at that local area will help reduce your symptoms. Also, be careful that you warm up before you start exercising and cool down after you exercise.
For your sciatica, it would be best if you avoid lifting heavy weights ( lifting heavy weights will not make you lose weight anyway) and avoid forward bending.
All the best for your weight loss
Hope this helps.