Hi @Meowmy nice to meet you. The forums are a wonderful place to come when you need support. You will find others with similar issues in time. I've been around for 4 1/2 years on and off and will always try to respond if you tag me.
Probably the single most helpful thing I know of when feeling overwhelmed is to remember to breathe - slowly and deeply until the feelings settle down. Another thing the forums are good for is learning what triggers those feelings and learning to feel it coming on and catch it before it gets too full-on by using whatever you have in your 'coping box'. I call it a 'tool box' and rather than have an actual box, which some people do, I have a list that I keep in my 'Wellness Recovery Action Plan' folder and add to whenever I find something else that helps. The WRAP is really helpful for me. You can google it to find out more.
I also keep charts daily that I got from my psychiatrist that record mood level, sleep, anxiety, nervous agitatiion, and my medications. "Mood charts" are also available online. This is a link to the one I use. But there are many others. You don't have to have bipolar to use it. http://www.cqaimh.org/pdf/tool_edu_moodchart.pdf
This way I can see if things are starting to change (I have bipolar 1 and cPTSD) and catch them early before they escalate or take me down too far. If they change too quickly I will usually get an earlier appointment with psychiatrist or psychologist too. Staying compliant with meds prescribed is also essential for me. So it's a balance between therapist support, self-management and medication for me.
I don't know if you already have psychologist and/or psychiatrist, but whether or not you do I recommend starting with seeing your GP and telling them openly what's going on for you...and asking if a referral to a therapist is a good idea.
Best wishes, Eth