Sorry to hear that, if you have more or are getting more to proceed... go easy with steady and slow increments.
The best way to approach this whole thing in my opinion would be to get a nice quantity extra so that you have plenty of fly agarics, cut them in slices (I didn't mention that before but it maximizes surface area for drying everything about equally), dry them until cracker dry, don't test brittle parts but the most chunky meaty parts you see. If done, it should be possible to grind them well. When you grind them you mix them thoroughly, well continue mixing everything a little extra at the end there. Ideally use a machine to grind into powder, but otherwise try to come close to that.
Now the potency of your whole batch should be relatively even (= called homogenous), this makes it a lot safer to work up your dose level until reaching desired effects. Mushrooms are of course products of nature, and every specimen is different, and so they can vary in potency even if they grew side by side.
If you have not made your batch homogenous, you have that variability to take into account.
There may be other factors that could affect intensity of your results, I'm not sure which but possibly what / how much you ate before could be one of those factors.
So that is why I said go easy, other caps may be more potent