Estrela,
Not sure when your trip is but enjoy it!
Now my 2 cents...I don't know your condition nor do I want to come off as knowing it, but I have my own and the following is my personal experience and thoughts on the topic:
I did a Discovery Dive about 8 years ago knowing that I was a bit claustrophobic; I loved it! No problems, just didn't have time to get my OW.
Life happens -- flash forward a few years. I suffered my first panic attack after a close friend died from a heart attack. Next thing I knew I thought I was having one (a heart attack). Same symptoms (heart palpitations, sweats, dizzy, chest pains, numbness in my arm) but at 30 and in relatively good shape it turned out to be my first panic attack. Decided against medication and a few months later in an airport a lady collapses and dies from a heart attack, I get on my plane and I'm having another one (turns out to be my 2nd panic attack). Decided to see a doctor to get my issues under control.
Flash forward 3+ years -- I'm on Xanax XR (very low dose) and Effexor XR (very low dose) and have not had a major issue in that time. Last week my wife and I went to the Caribbean. Before we left we both agreed we wanted to dive again. Knowing what would be asked on the medical release I went to see my family doctor and psychiatrist to get their opinion on my ability to dive. Both agreed that my medication controls the attacks, but I (mywife and my instructor) need to be conscientious of the potential of an attack and end any activity and call it quits if there is a problem (hopefully at 3 ft. not 30 ft.).
I was upfront with the instructor and filled out the paperwork openly and honestly and gave him my release from both doctors. I could see he was a bit apprehensive (as I would be if a 6' 3" 275# guy told me he had a history of panic attacks) and he put me through the ringer at 3-5 ft. in the pool before we went to 10 ft in the pool. It took some time, but by the time we boarded the dive boat we were both comfortable that I could dive SAFELY (btw it was just the three of us in the class -- very helpful).
One side note here in an already long saga -- first drill, 4 ft in the pool -- instructor tells my wife to remove her reg and put it back in her mouth. She removes the reg takes a big gulp of pool water and in the process of bolting for the top kicks my reg out of my mouth. Instructor shows obvious concern as he sees my reg get kicked out of my mouth and assumes I'm bolting also...I lean over reach around find my reg and put back in my mouth, while staying under. He goes up to check on wife. Big relief for both of us, and set the stage for me getting my PADI Scuba Diver Certification. No issues, great instructor, great time! IT CAN BE DONE!
I'm looking to get my OW now and I think I may wait for a return trip with an instructor I already have rapport with, but I'm considering going to a local shop where a person I talked to before I took the trip seems like he could be a very good instructor (not sure I want to discuss the issues with him as I'm not sure what his reaction might be (see some of the above posts)).
Sorry for the rundown of the last 8 years of my life, but I've been through a similar situation and so far I've lived to tell about it. Will I have an episode one day -- maybe? I only hope if I do I don't hurt anyone else in the process, but until then I will pursue this great sport and look forward to my next time under the water. Take it slow, work with your doctors, your husband, and your instructor, and have fun -- 99.99% of the time this will reduce your anxiety.