I don’t feel I can cope mentally or physically

My LO is 14 weeks and I think she’s hitting that first sleep regression. She won’t nap unless it’s on me even though I’ve tried a nap routine and started it as soon as she gives me sleepy cues. She just screams on me till she falls asleep. If I try to put her down when she is content but drowsy she will scream. It’s only on me she screams the least and I can get the most sleep out of her. Problem is I can’t go to the loo, eat or drink. I can’t look after myself. She’ll then wake up and seem content so I would feed her in daylight, this is when I see she’s still tired and she starts to get agitated and I’ve missed the right sleep/nap window and we have another melt down. She’ll be awake 30mins and want another sleep because she’s overtired. I suffer from depression, anxiety, OCD and I also have a heart disease. I’m emotionally and physically tired from holding her all day and I’m worried my body can’t cope for much longer. I’m scared I’ll have a heart attack from the stress of it all. I persevere because I love her so much and just want her to be happy. I guess I’m not looking for advice. I just wanted to get it all off my chest because I feel so alone. I’m sure there are people I could reach out to but I have so little confidence that I can’t bring myself to ask for help. I know I need it. My brain is stopping me.