Feeling like a bad Mom

I have had nerve and vein pain for 3 years now. Honestly I have barely left my house since. Probably a couple times for his birthday parties and holidays at my parents. This has taken a toll on my mental and physical health. I feel like such a shit Mom. My husband does everything for him now. Today he had a concert. I didn't go not only because of my pain but my anxiety hit me too. I feel like the world's worst Mom! I cant do anything with him anymore. I love my son and husband so much but I'm a burden and I feel like they would be better off without me. Just felt like ranting because I have no one to talk to.