"Ice pick" headaches

Has anyone been diagnosed with these? I've a doctors appointment soon to check to see if I have them. I basically get really painful, sharp shooting pains on the left side of my head. The whole episode will last maybe 20 seconds or slightly more and then there will be a slight ache for a while after (it's barely noticable sometimes). This will happen a few times a day, most days. I've already been diagnosed with migraines and I'm on meds and so far they've reduced them from about 5 times a week to about 2 with a few debilitating ones a month. Anyone know any other symptoms I should watch out for or if anything helps reduce them?