Also I don't think it's a shed because they were falling out as I was applying the oil
If this is really what happened, then it's either what you bought was definitely not rosemary oil but rather something really harsh or you had a really low quality oil that probably didn't even resemble rosemary oil in the first place and your scalp is super sensitive which caused it to react that way + you'd probably still have had to used the essential oil straight with no carrier oil for such to happen (because diluting it in the amount of Carrier Oil you supposedly used would definitely not give it any harsh effects, not even skin irritation).
I literally just did a Google search to see if theres any articles or anything at all about Rosemary Oil and shedding or accelerated hair loss. And there is absolutely nothing. Literally nothing, zero, nada, zilch. You're actually the first person on the entire internet to claim that Rosemary caused hairloss lol.
Rosemary Oil has an absolute flawless track record in terms of such claims lol seriously search for yourself. At absolute worst I can understand if someone said they had no positive results, but hearing someone actually lost several hairs instantly - sounds unbelievable
I can only imagine how many more hairs you'd lose if you applied a far stronger topical like Minoxidil...
But yes the decision is all yours. Infact I'll only be visiting this thread in 3 months time at the very least (if I still remember) because right now you're too emotional and not giving anything enough time.