Tingling Pain in Calves and feet during straight leg Poses?

Hello. I have recently (in the past 2 months) started taking Yoga and Pilates at least once a week at my gym. I am taking Water Areobics 3 X week and Sculpt with weights about once a week. Usually work out 5 days a week. I am not real flexible, but I did take Yoga in the past about 10 years ago and didn’t seem to have the problems I am now. I am 32 years old and approx 10-15 pounds overweight. I had a baby two years ago, also. I am in general good health overall. (I figured it may help to give you all my basic info)

My main problem is that during any straight leg stretch, such as when I am sitting on the floor and trying to reach my toes or standing and bending over toward my toes, I am having some extreme tingling pain. The tingling pain occurs mostly in my lower legs (entre upper and lower calf area) and spreads all the way through my ankles into my feet. I don’t have any knee pain at all, but sometimes the tingling will go in the muscle directly above my knees just a tiny bit. I also do not notice any pain in my back area during these stretches, just my legs. Because of the pain, I can barely bend forward or over at all. It doesn’t seem to make a difference if my feet or flexed or not. I don’t even think about getting close to my toes and I don’t feel pressured either. I just don’t understand the pain.

I was wondering if you had ever heard of this kind of tingling pain and if I could modify the pose to correct my issue? Should I try these poses with bended knees? I have tried the bended knee a little bit and can get closer to my toes, but I don’t feel like I am doing the pose correctly. If I don’t do the pose correctly, doesn’t that just end up being a useless pose? At least that is how the teachers act about most poses, they use words like how they would rather us use blocks instead of seeing a “sloppy” pose. I don’t mind using blocks, straps, foam rollers or anything like that either. I have noticed that during the standing bend over pose that a block does not make a difference in the pain, because my legs are completely straight and still hurt. I have not talked to the class teachers about my issue, cause they don’t seem to know a lot of good answers to other questions (sorry to say).

PS. I don’t seem to have any problems while doing a butterfly pose and bending forward, just to let you know.

So, any advice you could give me about a pose modification or if you think I might have something wrong with my calf muscles, etc would be helpful.

Thanks again, Debbie