Stomach pains leading to panic attacks. Ulcer?

Hi been having problems with my stomach for 3 and a half months now and was wondering if anybody was experiencing the same things as me or had any info on what i could do to help.

I have a dull pain in my upper abdomen just below the bottom of my rib cage almost all of the time and sometimes the pain will be a gnawing/burning pain, additional pains occur everynow and then in the left/right lower abdomen areas. At times i get really nauseous/dizziness and what feels like a lump at the back of my throat whcih makes me feel like i need to be sick, but for some reason im not vomitting. my stools were inconsistent at the start, it was loose and in bits but now as i have been eating a better diet that seems to have got better, ive only had dhiarrea* 3 times in the last 4 months.

I work as an electrician and so am up early in the mornings to go to work, but when i get up and go downstairs i get this chill like feeling in my stomach and the pain starts. I have to get a bus and a train to get into work and this dosn't help with the nausea, sometimes the pain doesn't ease up by the time i get to the station so i just go back home, sometimes the pain isnt that bad i continue with the journey, which is very unpleasent when your stomach hurts. Usually when i get to work and start working the pain eases up, sometimes it doesn't and i go back home but last time i went to go back home i had a panic attack whilst getting on the train. I couldnt work it out, ive never been afraid like that and ive never been travel sick or clostraphobic so why was i panicking?

Ive been to the doctors about 7/8 times and at first they diagnosed me with IBS and so I went and asked a few people i know who have IBS and they said the symptoms wern't the same so i went back to the Dr and she said it could be a stomach ulcer so now I'm awaiting an endoscopy, hopefully something treatable shows up so I can get rid of this pain. It's so frustrating.

since the panic attack i haven't been going in to work and I haven't been going out at all and as a 20 year old male its annoying. Thanks for reading such a long post and if anyone can help please reply.

Regards Marc