while I also agree with letting go of expectations
in a meditation session, in favour of just doing the practice to the best of your ability (while still remaining sensitive to what works and what doesn't so you can remember that), I also think that if a significant obstacle has arisen, it is ok to seek some guidance from a wise and experienced meditation teacher, who knows the terrain, has probably been where you are right now, and might be able to guide you through.
Some make themselves available to talk over the phone.
So I will not advise regarding meditation itself, because I really think that is best left to an expert, and I mean someone who has mastered the method you are engaged in. But I will remind you (remind because I'm sure you already know the following) that 1. all
of the Noble Eightfold Path, every single factor, matters a lot and we can always work on improving the other
factors, regardless of how our meditation practice is faring at present. We 'western, intellectual types' often tend to be too overly focussed on the samma sati / samma samadhi limbs of the Path (as compared to the other six limbs), in what I think is a slightly unbalanced way (please note - I include myself in that admonishment, and I apologise for generalising
Virtue. I heard more than one meditation teacher say that most problems come not from wrong technique on the cushion, but from what we do off the cushion. Increase and purify Virtue, that can help. 3.
Be kind to yourself.