from combo to mini pill

So after many years of taking a combo pill, my new Dr changed me to the mini pill since I am at very high risk for stroke. Has any one else gone from combo to mini? Any complications? I began the mini pill 8 days ago to include today and I have felt extremely irritable. Like, noticeably about-to-come-unhinged-irritable about two days into the new mini pack. Also, I began spotting on day 3 of new mini, Wednesday morning, and today I am apparently on full flow.... which is confusing since I JUST had my last combo period beginning less than 2 weeks ago. I began taking the mini, as my Dr instructed only after I completed my last combo pack. Please help and provide your experience ONLY if you have gone from combo to mini, thank you. Also, is there a timeframe to wait to have sex? Because my S.O. is coming back this week from a very, very long underway. lol