I'm very sorry for your chemical.
I had a failed DE/early chemical in January of this year. My RE said it would take at least 1-2 cycles to get my cycles back to normal. I ended up having a relatively "normal" cycle right away, but I do think the drugs remain in your system for at least a month or two, which could account for why you're having different/strong symptoms.
If AF does not come soon, would you consider going in for a beta, just to double check? It may be worth having some b/w done just to check where your levels are.
Hang in there and, FWIW, I TTC'd with my OE during those first few months after the chem, since you do hear that you can be more fertile during that time.