Same thing with me, but my most intense part of the elliptical workout is 20 minutes in, and I am basically sprinting. Instead of going heal to toe, which is normal, this part of the workout I catch myself so focused on the intensity that I am on my toes for the last 10 minutes. This causes my feet to tingle as well, so I have to concentrate on stepping correctly to keep that from happening. After the sprint, which is still slow for other people around me (I don't care), I do a 5 or 6 minute cool down, and my feet go back to normal again. It's all about blood flow. Regarding your shoes, I don't know what you are wearing, but I like a good running shoe because of the cushion. Even though the elliptical is low or little impact, you are on the thing for 30 minutes or more, so you do need good cushioning.