Very sick cat or is Vet scamming me?

Yes I am from Morocco and live in Germany. This is a family pet living with my family. He is indoor/ outdoor.
At first I was convinced it was due to a hairball, after he kept vomitting we suspected an obstruction, but there wasn't any. But everytime I brought him back home, he spent the whole night making this weird cough sound, as if he was gasping for air. He would stand from time to time to cough louder, but the coughing just hasen't stopped in over 48h.
Which is why I don't understand why the vet is talking about gastric problems and Pancreas, without checking other things. I have expressed my worries several times, called a lot, they said he was not coughing and was doing fine. Which is unlikely because nothing was done to treat that particular symptom, and they still had to keep him overnight.
I was told that if I take the tests to the vet in the Animal shelter (which is free), they would give me a diagnosis, as they have nothing to win from keeping my cat for no reason.
But then again, the blood tests could be inconclusive.
Maybe I am doubting everything because I'm worried, I don't know.

Well to be honest the symptoms of asthma and gastric problems aren’t the same and I wouldn’t have thought either needed antibiotics unless the vet suspects an infection
I know nothing about vets or their professionalism in Morocco
Who advised you to take the xrays to another vet ?
Are you and your cat native to Morocco ?

I guess you guys are right. I mean the best I can do now is have him hospitalized. It can't make him feel worse.
I can't wait to go and see him tomorrow.
I really hope it is something that can be treated.
I was advised to take X ray and Blood tests results and take them to another vet practice.

Welcome reemah if you are new.

My experience of vets and cats is that they work their way up treatments and diagnostics, if the cat feels better after antibiotics all well and good, if not they run tests to see what they're missing.

I hope your kitty is on the mend soon, it sounds very worrying.

I agree it's very unlikely the vet is scamming you - it's sometimes difficult to diagnose symptoms so they have to rule out the obvious first. I hope they soon find out what's wrong - it's very distressing seeing your pet so poorly.

Thank you for your response.
No I don't have pet insurance.. The thing is the two first times that I took him there and described the symptoms - I even had a video - I had less than 5 minutes with the cet who only took temperature. He did not check any of the other vital signs.
And after X-ray he said something seemed off with his Pancreas, but didn't say what it could be.
I want him to be taken care of the best way possible, but I am not convinced with what the vet is saying. He doesn't sound convinced either.
All the videos I have seen on Internet made me belive my cat has Asthma.
Either the vet knows what's wrong and is trying to delay the diagnosis, or he really does not know.
I feel helpless.
PS: I live in Morocco, and the stories I read about this are not reassuring. It has just become hard for me to trust vets.

If you want a diagnosis then they have to run the tests. If your cat is still poorly the tests need to be done. Why do you think he is scamming you?

Your vet is not scamming you. Vets do not scam anxious pet owners. The trouble is that gastrointestinal problems tend to have very similar symptoms, so the vet needs to work through the various tests and investigations to find what the trouble is. This can take some time. It was sensible to start with the least invasive treatment and then work up to more invasive actions.

Do you have pet insurance you can claim to recover the treatment costs?

I hope your cat feels better soon.