Having An Issue With 7oh

I've been using 7oh for the past few weeks. Doing 70mg mostly every 2 days. Whenever I do it, it's awesome and euphoric for a while but once it wears off I just get this awful headache every time. Like the entire next day I'll be basically bedridden with the headache, sometimes I'll eat something and won't keep it down too. Does anyone else have these problems? Is it how I'm taking them? I wouldn't expect to get what appears to be withdrawal symptoms on my first usage.