Hi Daniel...welcome..
Looked it up.....Grandpa powder = caffeine+aspirin+paracetamol. Caffeine is our friend...the powder gets it there quicker....but careful re longterm use...the aspirin and paracetamol in there can have significant negative side effects...
What is the availability of energy drinks in SA? Anything with at least 100 mg caffeine and 1000 mg taurine (caffeine booster among other things) taken quickly and in my case, super cold, will get ya the needed effect (blood vessel constriction) quickly as you crank open the OXYGEN tank.
Speaking of OXYGEN....if your CH progresses (likely but let's hope not!) you're gonna want an effective, quick, cheap, safe, medically acknowledged, side effect free, front line BEST abortive. That would be O2! Dunno what your med system is.... but you might wanna start now looking into how to get the right script and the logistics of obtaining. High flow (15 LPM) or a demand valve type, proper non rebreather mask, and proper technique.... has saved the life and/or sanity of many a clusterhead....
In the meantime.... look into the vitamin D3 regimen...also quite effective for a high percentage of clusterheads...
Best
Jon