I feel like I'm losing my mind

My lb is 3 months old. I love him more than anything but I feel as if I'm losing it. I'm incredibly anxious all of the time. I spend the time he's asleep worrying about when he wakes up, and the time he's awake worrying about what he needs and if he's happy. I also convince myself I can hear him crying all of the time even when he isn't, and spend more time awake than asleep checking he is ok.

He's had some problems with colic and also ended up in the hospital after his first jabs. I feel that this adds to my anxiety.

Everyone keeps telling me how happy he seems and I love how much he smiles but I worry I'm not doing a very good job.

Any messages of support would be very helpful. Please keep nasty comments to yourself as I need some positivity right now.