Environmental Allergies Or No

I'm dealing with something very weird. This is the 3rd time in the last 5 years or so. I have seen an Allergist, a ENT doctor, did many tests and no one can help me. Now it's back. I get a chronic cough as if I'm being choked from the inside. It's like straight pins poking me way back in my throat. This cough gets so hard and intense, you start to urinate on yourself, your eyes water, you get dizzy along with a few other things. The only thing that would help is if my doctor gives me a steroid shot. It takes it away in about an hour. You can only have so many of those. I have a new doctor and I tried to tell him this is the only thing that works. He's telling me to try this or that and I already know this won't help. I can't workabd cough like this. Has anyone else every heard of this. We think it's environmental because certain fumes like strong paint will do it. I also came in contact with preservatives that was shipped to my company and the powder spilled out and I cleaned it up. I need help to finally keep this from happening, it's taking over my life and I just been suffering. Any ideas on what else I could try.