Is it normal to have sensitive sense of smell?

So there's plenty of different kinds of scents that cause me to get raging headaches, intense nausea, shortness of breathe, etc. Some of the things that cause this to happen is alcohol of any sort (drinking, rubbing, etc.), colognes, perfumes, certain foods, flowers scented lotions. I can't be around any of these things otherwise I feel like my head is being smashed open with a sledgehammer, struggle to breathe, have a constant feeling of needing to vomit, and am always extremely nauseous to the point of dry heaving and nearly vomiting.

I'm also afraid of it causing issues with my current relationship with my girlfriend. I've told her about this before and she's fairly understanding about it and does her best to not do anything that'll cause me to have these incidents occur.

I'm not sure if this is normal or not, but it has caused me a lot of issues in the past, and I can't afford to go to the doctor's or anything. If you have any viable suggestions, feel free to share.

Please... no trolls or bullshit comments. Only ones that are constructive/related to this post.