In my experience, and that of a few people I know that have gone onto meds, they will start you on a low dosage regardless and then adjust if necessary after 6 weeks or so minimum - usually something like Setraline, Fluoxetine, Venlafaxine.
I would recommend doing it, simply to get those fluctuations in mood stabilised and allow you to hopefully find a bit of an even keel. You might have to fight a couple of side-effects like fatigue / thirst etc whilst you adjust, but again, it's a small price to pay quite honestly. When I started meds I used to take them before bed to try and minimise any of these.
Whatever happens, I hope you find the benefit sooner rather than later - good luck with it x