Imatrix is just one of a large family of triptans. Some of the others may work for you and may work better without side effects. These include:
zolmitriptan (Zomig)
naratriptan (Amerge, Naramig)
rizatriptan (Maxalt)
almotriptan (Axert)
frovatriptan (Frova)
eletriptan (Relpax)
D.

Good luck. Headaches suck.