Is it normal to feel pain 10 days after foam sclerotherapy?

The pain you're experiencing is not unusual. It should go away in a brief amount of time. Unfortunately, sclerotherapy is typically a little slower healing process than other vein treatments. If the pain and issues persists, please contact your vein specialist. Best of luck! 

Sclerotherapy is used to treat a variety of different vein sizes. If you had very small spider veins treated, it would be very unusual to have any discomfort at this point. Sometimes we inject larger veins (varicose veins).  When we inject these larger vans it sets up a larger inflammatory process. This can lead to pain in the treated veins for up to 2 to 3 weeks. If you are having pain that affects your ability to walk, although very uncommon, you may have a blood clot. Even though your doctor is gone, his/her office should be able to arrange an ultrasound for you to make sure nothing serious is going on. That is what I would recommend. 

It is normal to feel some mild aching or discomfort as the veins go away.  This should not be bad or cause the leg to swell much.  I would have the leg evaluated to play it safe.  See your physician or go and have an ultrasound at an urgent care of vascular facility to make sure that you have not formed a deep blood clot causing your problems.