I am in the same situation as you. I don't want to flip FCEL in this circumstance. What I already sold I am not regret. But for what I have now if I sell I am a bit concerned to buy back at a much higher price.I prefer just hold and wait.
I couldn't pull the trigger either. I took the money out of my account to stop me. I needed it in savings for padding anyways. Still sitting on a nice bump if the stock bumps.
The only fuel cell stock that wasn't downgraded or reported as overvalued with the significant increase in share price recently was Ballard. There have been articles about plug Fuel Cell Energy and Bloom all being overvalued right now. Bloom is extremely volatile anyway.