Welcome to the Forum, I'm sorry it's taken so long for you to get a reply, it is not you, it is the system here which sometimes lets this happen.
Having a partner partner that suffers from anxiety and OCD is pretty difficult and worrying. There really is no guide book on what to do. As a first step I'd suggest you go with your partner to visit his medical team and discuss this with them.
I was supported by my partner when my anxiety and other matters were pretty bad and I think the one thing that gave me the most comfort and stability was to know my partner was there and would not abandon me (though I would not have blamed her if she did).
The second most important thing was to ensure my medical treatment was going ahead, and that I took my meds and attended all appointments and did whatever therapy exercises were set.
The third was to provide perspective. When in an anxious state my ability to see problems clearly and not regard them as disasters was absent. My partner was normally able to provide a more rational view.
It was not easy for her, some days I'd be ok that she talked and asked how I was, other days I'd be angry and resentful. Trying to deal with this was hard for her.
With all this pressure on you, as it was on my partner, it is important that you have support. Do you have a family member or friend to care for you and give you support? Trying to deal with all this by yourself in isolation makes it a great deal harder.
Please feel you can talk about this anytime you wish, it is not a simple situation