Tren raises blood pressure which may be the cause of your headache
get one of those digital wrist measurement BP machines at the pharmacy and check
some natural things you can try for lowering BP before you get a script:
l-taurine
grape seed extract
magnessium/potassium
co-q10
garlic
drinking lots of water may help, tho not as much as if the BP increase had been from an aromatizable's water retention