You NEED to detox off of imitrex before you dose with RC seeds.
Triptans are the enemy of alternatives. I would suggest getting a  high flow regulator and lots of coffee before attempting detox. You need an abortive, or detox is not a good option. Get those and see if you can live with them for an abortive then detox.  
clusterbusters.com, LSA FAQ's read this information. It should answer your questions better than I.
Please check with the doc before you change your meds. Alternatives are meds. considering all the meds your on you need to get a plan for detox and work with the doc or the alternatives will fail.

all the best
thebb


Hang in there :)