Ivabradin for POTS

Hey guys, does anyone of you get IVABRADIN (in Germany they sell it as „Procoralan“) as a POTS treatment? I also suffer from migraines and before the POTS diagnosis, I got Metoprolol as a migraine prophylaxis; this also helped with the dizziness I already experienced (without knowing it was the POTS) but didn’t help with the migraines and made myself weaker (also struggle with CFS). Now we started a Ivabradin treatment and I wanted to know if anybody else here has experiences with it? How long did it take to work? Which kind of side effects did you experience? It’s my third day but I experience the worst headaches (different from my migraines). Anyone had this as well in the beginning? Best for you guys