Okay, let's cut to the chase.
I have 2 budgies, Kiwi and Sherlock, Kiwi is not home, and he is gonna be gone for around 1-2 more months (the reason doesn't have anything to do with the story, so therefore is not important), but Kiwi isn't the problem, Sherlock is.
For the past 3-4 weeks, he's been having phases of vomiting (I'm not sure how to put it). Basically every 3 days of acting normally he vomits once (BTW I'm sure he's vomiting, cause I have had budgie regurgitation experience with both of my budgies) and then vomits a few times every now and then (usually a few times an hour), is fluffed up most of the time, looks tired and has diarrhea. I have given him some millets which are supposed to help his immune system and they do help his state a bit.
But he still vomits and has diarrhea, just on a lower level. The next 3-7 days (no matter if I give him the millets or not), he is completely normal, until he starts vomiting again. And the loop goes on.
I should also mention that the vomiting phases last up to 3 days (it seems that I haven't mentioned that).
I won't be able to take him to the vet up until next week, but I'm not really worrying cause he isn't sick constantly. I was wondering if any of you, people on the talkbudgies forum had any idea of what could be causing this behavior just so I know. I will definitely take him to the vet next week, I just really NEED to know what could be causing this to happen cause I can't find anyone with a similar case anywhere online.
Thanks in advance