No mental health support in western trust

I have autism and borderline personality disorder. I have been managing okay without meds for the last year or so but have been having regular check ins with a psychiatrist since my diagnosis of bpd. I had 5 consecutive miscarriages and it got to the point where I was struggling with my mental health 90% of the time. Got seen by a specialist who helped us get and stay pregnant so my mood has been extremely positive for the last few months as it feels like a literal miracle. I was in the process of being assigned a key worker to support me after baby was here as we were all expecting my good mood to drop drastically and probably really struggle due to the hormone drop, such a big change, tiredness ect. I moved house to be closer to family which meant my trust changed. Got assessed today by a mental health nurse and told me everyone has autism and bpd is a name for reckless teenagers. Completely dismissed my struggles, and went on to say I don't need any of their services. I told them about my fears and worries about when baby is here and got told everyone has baby blues... I had to really fight to get the supports in place to support me, and I thought I was finally in a good place but it turns out I've been completely dismissed. I've been on and off medication for years, and not medication a gp can prescribe either if that says anything but hey ho they don't think I need any help. How did I go from seeing a psychiatrist every 8-12 weeks, being assigned a key worked to check in twice a month, to being dismissed from the mental health team completely by changing address?! Starting to really stress myself out, because if I start to go down hill it's a rolling ball that's nearly impossible to stop. I won't have the time to sit and wait for years for a referral, the damage will be too much. We knew how badly we wanted a baby, and knew how tough it was going to be, and if I knew I had zero support incase things started to go wrong we probably wouldn't be pregnant now. I'm not saying I'm insane or anything like that, but my lows can get very low. Normally I can sense when my moods about to drop, and I can lift the phone and get the supports in place before the drop hits, so it's manageable for myself, but with zero supports or structure in place in case of a drop means it's going to be as severe as it can get.