First things first: Did you banish before starting the ritual, and were you able to verify it was Balan and not an impostor?
Doing magick attracts a lot of interest in the astral and can cause you to get attacked afterwards as well as during, everybody wants a piece. So as well as setting up protections to keep your magickal working clear on uninvited guests, you also want to set up wards on our house and sleeping area to keep out nosy neighbours. It’s exactly like locking your door or having a fence around your garden. Otherwise anybody can walk in, and they might be criminals.
My first guess is you got parasites, hangers on. It’s very common for new mages to not realise how busy the astral is and that they need to work at keeping themselves unaffected by unwanted entities.
I wouldn’t assume it was Balam, or even that you contacted Balam at all f your senses are not open enough to have been able to check.
It’s such a common problem we have dozens of tutorials written by members on how to fix and avoid it.
You’ll want to get your spiritual hygiene sorted out, and start work on developing your astral senses, then you can know you have a decent chance at avoiding impostors and parasites.
Since you probably already have attracted parasites, now you want to get rid of them as the draining may not stop until you do: