You say you get them at night (Which is very common). Is there anything else in your daily life that triggers the panic attacks? Have you seen a psychologist about these panic attacks? Are you currently taking any medication for them?
I suffered from panic attacks for about 6 years, from 13 years old until I was nearly 20. Mine started out from a bad experience with marijuana (Go figure ;P) since, as it turns out, I'm hyper-sensitive to THC. Anyways, my 13 year old brain wasn't prepared for the hallucinatory effects it had on me, and I suffered PTSD from the experience (Which I kept hidden for two years). By the summer of my 15th year, the panic attacks had gotten so bad I became both claustrophobic and agoraphobic--I couldn't leave my house or even enter my bathroom without having a panic attack.
I went to therapy and started on Paxil, and began the rough process of re-acclimating my mind to everything it mistook for panic-inducing.
The keys to a therapy regiment is controlled exposure to the stimuli that causes the attacks, slowly increasing the length and intensity of exposure over time, discovering and confronting the root of your mental disorder, and, of course, emotional support. Drugs can assist if the stimuli is too difficult to interact with, but it is not a substitute for therapy.
What I'd recommend is talking to some of your training partners about this and recruiting them to help you as follows: Roll as usual with them to the point of fatigue, then switch the roll intensity to more of a hybrid flow style--Have your partner's start in top position and maintain good (Though not crushing) pressure, but do everything slow and controlled. In fact, I'd probably start with them just maintaining a top control position that troubles you, and allow them to do simple transitions while you just focus on breathing, relaxing, and if possible, simple defensive posture.
During this process, it's important you try to not tap out. If you run away from the problematic stimuli, you're only negatively reinforcing the panicked reaction you feel--Keep in mind, though, that everyone is human. Sometimes the stress will be too great and you have to stop. For these situations, I'd have a simple code with your training partners to tell them when to ease up, and when you need to stop entirely.
Another thing to keep in mind is this: Most panic disorders operate as a feedback loop. That is to say, when you first begin to experience panic symptoms, you will immediately remember the sensations of previous panic attacks. This will fill you with immediate terror and dread, and in turn, will feed into your current panic attack, making it worse. It is important, when having panic attacks, not to focus consciously on the immediate symptoms you are experiencing (Trouble breathing, rapid heart rate, dread). If you do, you'll only enhance the feedback loop and worsen the panic attacks to the point of debilitation. This is
much easier said than done. The art of not acknowledging your panic symptoms takes a lot of practice and experience, but the only way to develop the skill is to expose yourself to the problem stimuli and make the conscious effort to relax. Everybody has different methods of doing this (Personally, I have to close my eyes and listen to something engaging, like a conversation or a television show), so just try everything to see what works. You're situation is a bit difficult in that you are limited in your possible responses (Since you're grappling), but that's no reason to give up!
For reference, I thankfully no longer suffer from panic attacks, even off my anti-depressants (Though I've had to restart them after a long hiatus due to depression). In fact, I haven't had a panic attack since the tragic Boston Marathon bombings, though that was for personal (And legitimate) reasons. Like BJJ, the key to therapy is putting in the hours on the mat.
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