Hi Comgrad

It does sound like it could be anxiety, especially the lightheadness\dizzyness. Vomiting, is also something i have experienced with a panic attack.
Anxiety can also trigger IBS which would explain your other symptoms, there are many studies that suggest the guy is intrinsically linked to mental heath and stress/anxiety can cause disruption to your digestive system.

On the other hand it could be a severe food allergy. Has your doctor run any food allergy tests? Sometimes these can develop later in life and food you have previously had no problems with can suddenly induce a reaction. Its something worth considering as you have eaten before the symptoms each time.

If it is anxiety your sleep pattern is definitely something that can bring on attacks. When my sleeping pattern is altered it increases my level of anxiety, before i got my anxiety under control if i hadnt slept properly i would sometimes have to leave work early due to my anxiety.

Are there any thoughts rushing through your head before your symptoms kick in? Are you thinking about worse case scenarios, such as the day not going well on the day you had the episode in the morning, had you done something that made you feel worried about your relationship when you where with your girlfriend? Obviously going back to a girls house on a first date there are plenty of anxious thoughts that could rush though your head.

I would advise against medication if possible as i found it to be unhelpful in the long run and i personally it think it heightened my anxiety. Alot of the medication also takes a number of weeks to work and if you do what to come off them most you have to wean yourself off gradually which again is not a great process.