I've had two rounds of cbt, both for health anxiety, one which finished in May. It is definitely helpful in terms of being given tools to help challenge the thoughts/ beliefs behind the anxiety and strategies to put in its place. However, for me it only went so far and I needed both hrt and an srri to really get my anxiety down to a more manageable level. Even now I have active flare ups and, at that point I need either a beta blocker to reduce the physical symptoms of anxiety, or diazepam (valium) to take the edge off and help slow my thoughts. Then, when these take effect, I am in a better place to apply the cbt tools I have learnt. I would go back to your GP and see what acute / ad hoc medication they would prescribed to help alongside the cbt.
Can I ask, what do you do when you stay in? Are you able to distract or take your mind off whatever you're anxious about? If not, and you just ruminate and get even more anxious, then it is worth forcing yourself to get out and about or at least do things at home that keep you mentally occupied. My instinct is to stay home too, but I end up in 'freeze' mode, doom scrolling on my phone or checking my body, it is not constructive. I don't know what your anxiety is rooted in, mine is health, but it would be worth thinking about what your triggers are and whether what you do at home is making it better or worse. Good luck, I know this is so hard.