As I also said, check in with the other players at the table and the DM about what kind of expectations they have. I not only wrote that; it's in my sig.
As for what I would do?
First, I would wonder why battles were becoming harder and harder, why it felt like we were fighting short-handed. I would start thinking about why it was suddenly harder for all of us to achieve narrative goals.
After a while, I'd presumably notice that your character was not hitting creatures, was absorbing more damage, and was requiring more frequent emergency measures to bail out. Then, I'd try to diagnose why this was occurring. Are you devoting resources to other things that equivalently help out the party? Then, that's fine, provided that you're making sure that other people know not to devote resources to that choice. Are you new to the game and need some help? Are you unhappy with how things are going? Well, then we can figure things out, pretty easily. Some people don't like the mechanics of the game; if I can lend a hand with that and let them shine in other areas, what's the big deal?
BUT: if you're taking magic items others should have to make up for these choices, that's a problem. That's a problem, because that's when your choices impacted someone else's fun.
And if someone's character dies because you can't hit the side of a barn or soaked up all the healing? That's a HUGE problem, because that's when your choices impacted someone else's fun. That's when I get angry.
So, yeah, if your choices are going to impact someone else's fun, the least you can do is let your fellow players know.
Understand my take on this now?