So sorry that this happened to you. Just know you aren't alone. There are plenty of us who have suffered acoustic injuries.
It can take a long time for things to start to improve, but everyone is different. You need to be careful of too much loud sound exposure now and in future, which is actually something everyone should be doing anyway.
You took prednisolone which is a start in the right direction. Some people take NAC and other supplements to try and mitigate further oxidative stress caused by loud sound.
For now, if possible, I would be staying at home as much as possible to let your ears rest.
I would also be avoiding any invasive tests or procedures from audiologists or any doctors, aside from a standard hearing test. Even though some doctors are well intentioned (ie not just lining their pockets with money), they can/do inadvertently cause further issues.
Finding someone who actually understands issues like acoustic trauma is hit and miss. ENTs are notoriously bad in general unless there's an obvious medical issue, so being careful with medical advice is advisable from my experience. I wouldn't be letting them to do microsuction, ear syringing, loudness discomfort level tests or other things like that.
There are some good ones out there who know a thing or two. I found reading stuff like this helped somewhat in terms of understanding what could be going on:
https://dwmaudiology.com.au/services/acoustic-shock/
https://dwmaudiology.com.au/services/hyperacusis-and-misophonia/#tonic-tensor-tympani-syndrome-ttts
Those symptoms you describe are ones that I have had too and I believe some can be attributable to the middle ear muscles (Tensor Tympani and Stapedius), which can become overly reactive/sensitised to sound as a way to protect the ear.
Getting plenty of sleep is very important. If you have trouble with this then your GP would hopefully be able to help.