Bottom line: You need bloodwork before determining anything for sure.

In the meantime, some P5P, maca and an L-Dopa supplement should provide some symptomatic relief and get you feeling more excited. PDE-5 inhibitors are also OK to use to get you through situations like this. Now that you're thinking about it, and worrying about it, the likelihood psychological ED will be in play is huge. You need a few 100% sessions to get your confidence back.