One thing ppl who don't have chronic migraine don't realise is how much it affects me on days I don't even feel head pain. I'm so weak today but my head doesn't hurt... It's just I literally have no energy and every muscle hurts. This might be a prodrome to migraine of course. 
I'm assuming relpax is a brand name but yeah zolmitriptan, rizatriptan and the newer naratriptan and frovatriptan are useful. I just went off my preventative actually and it's going well. Since you're curious here's an extract from my latest report.pic.twitter.com/bXsnlb9aUP