I feel broken

My mental health is really bad at the moment. I'm short of breath, have stiff shoulders and neck, my stomach is in knots, no appetite, headaches and I'm struggling to get out of bed each day. I feel disconnected from my own body, I feel lonely, heartbroken, sad and so many other emotions. I've recently changed my medication to a different antidepressant so I knew that I'd experience some anxiety while waiting for my body to get used to them but this is horrendous. I've also just started cognitive behavioural therapy so I'm not sure how that's going yet as it's all still new. I put in a brave face to people so no one has any idea I'm feeling like this and I feel stupid hiding it because mental health is no joke and it's nothing to be ashamed of I know. But I'm the one who cheers everyone up, I'm not the one who's down. I hate how life is moving on and I'm stuck in limbo pining over a past that was no good for me. I've been through a lot, a hell of a lot in fact. I miss my relationship even though it was bad. And I've just received news that my ex is having a baby with someone else, we only broke up last year. I feel like I'll never find love and ill always be on my own, like I'm not worth it. I'm trying so hard to over come this, with therapy and medication but it feels as though its never ending, I'm drowning