If it is a blockage that is causing your bird's problems, you'll have to stop him eating any fibrous stuff.
Once Boo's innards were blocked, and ever since, ANYTHING he eats that is not food or leaves or bark causes another problem. While before, he could chew on paper or other shredding toys without any problem, now he cannot. These things would not normally cause a problem in a bird with a healthy working gut.
I had to throw out ALL his favourite shredding toys and anything with rope or fibre on it, even though these would normally be considered bird safe. (And he hated me for it!)
Stuff around the house had to be removed or covered or adapted so he couldn't chew on it.
This chew spot on the mirror was fixed by putting a simple cover on it, just on the bit he liked. He doesn't chew it anymore.
I put a shiny piece of paper on the lampshade so he can't land on it. Another problem fixed.
And he only gets leaves and branches and bits of eucalyptus bark to chew on his play gym.
Early on, when his blockage was life threatening, he had thrice daily crop washes directly into his gut, three times a week for a month. Progress to check to see if the blockage was shrinking was done by two types of x-ray each week. Also, he was feed barium meal once a week, both for one of the x-rays and to help push the blockage through his system.
During this time and for a while after, he was on a variety of meds to treat different infections arising because of the blockage. He had a yeast infection, three different types of bacterial infection, and later a nasty pseudomonas bug infection. These arose at different times along his blockage illness, and each was treated with a different drug. There were infections in both his crop and his gut.
Once the acute phase, or the emergency, was over - from memory about six weeks or two months later - he was put on a special diet. Which he still has to this day.
A few months back he managed to eat some paper napkin (and only a tiny bit too), and it started the cycle all over again, but this time not so bad as the first. Once again he had to go through a mini-form of the earlier treatment.
As you can imagine, this whole thing cost an absolute bomb in vet fees, and I can understand that it would be out of the reach of some people.
I would suggest:
1. Get rid of, or make safe, anything he's chewing on that he shouldn't.
2. If you notice his poop getting green, get it tested and treat for the specific type of infection he has. Lurid green poop means something weird is going on.
3. Twice a week, swap his fresh water for pure weak camomile tea (it's good for gut infections)
4. Find a mild water based crop cleaning agent. I use a product called KD powder. This also gets used in his water twice a week. Someone on here might know some product you can use there.
Hopefully, if your bird does have a blockage, it isn't the awful mess Boo has managed to make, and it will work its way through by itself without all the drama we had to go through.
However, you may still have to treat him for infections that arise along the way.
And just make sure he stops eating ****!