hmmm - are you sure you are blocked? I get all sorts of 'resistance' feelings, including being blocked, not connected, etc (well, less these days, but I did especially when starting to give healing to clients). I learned to just irgnore them, plus to ask for their removal, and just do the healing anyway(even if it feels like nothing is happening). Usually clients still feel more relaxed, etc....
Another option might be that you do not do enough cleansing work? Especially consciously connecting/ asking to be connected to healthy Earth energies, and asking them to pull out negative and stale energies, and giving you fresh energies up.... If we get overloaded with neg energies, bottle necks, like our chakras can possibly clog up, and energy flow grinds to a halt. That used to happen to me in the brginning, when i tried to release too much at a time. Had to learn to ask energies to please leave in an orderly fashion, without cloggging up avenues out. If stuff is clogged up, just ask for whatever specialized extra support which might be required.
Or you might be going through an energy system restructure/ upgrade? Just ask, and if that is the case, ask how long it will take, and ask for other avneues of healing for e.g. your mum. That said, I have had a few upgrades in my times, but never had to stop working because of them.
A healer friend of mine is frerquently told that she should not give any healing, but she is in her late 80's and they might say that as to not overtax her ageing body?? And or she does not work with 'ultimate good' helpers, who might be messing with her???
Hope it resolves soon!
Love and Light!