I. M. Here, I really don’t think that’s ga’avah. It’s not necessary to flaunt what you’ve done, that might be defeating the purpose. I think it’s perfectly ok to feel good about doing a good thing. Also, remember that when people are on the receiving end of a favor, it makes them feel better when they thank you. So, when you graciously accept their thanks, you can think that this is part of your chessed.
Recently, I went through a very, very hard nisayon that deeply affected me and I fell into a low. I volunteered for a chessed organization at the time and it did make a difference.
striving, best of luck to you in dealing with it. Hashem should give you the strength to snap out of it ASAP.
~a~