Welcome to SI. Congratulations on getting sober. I have a son who is an addict and he tells me that he uses because he doesn't want to feel his emotions, it's just easier not to.
So...I guess that what comes with sobriety is dealing with life, without the haze of the drug, whatever it is. The thing is, sometimes the drug just gets replaced with another. Your A is a good example of that.
Sorry to be so longwinded. I guess I just wanted to ask what you are doing to prepare for this onslaught of emotions, of actually feeling stuff, now that you're sober. What healthy coping mechanisms have you learned? If the answer is none, then it's time.
Are you in IC (individual counseling)? You need to learn healthy ways, develops healthy tools, to manage your life without drugs, alcohol, cheating.
You also need complete NC (no contact) from the OM. Are you NC?
I know it's a lot right now, but you also at some point (sooner rather than later) need to tell your BH.
Keep posting. You will get a lot of support here.
ANTake up your space (and do it well).
"That's the thing about pain, it demands to be felt."