PTSD Triggers/DBT Struggles/Attention Seeking Behavior

1. I have been working on my PTSD for a couple of years now. I was sexually abused as a child and raped by the same person as an adult. I have worked really hard to move forward in life and take back the control. Lots of triggers were becoming less intense and the flashbacks were decreasing. However I've been going through a lot of test and intimate examinations due to an on going health issue and I have a lot more of these examinations coming up. Every time I freak out and it causes a flashback and I feel my PTSD had spiraled to that out of control stage again. I can't get back to see a therapist due to NHS waiting times for 7 month. I'm really struggling with this and life events that have all came at once. My question being although I've tried to work through all of this why do all these new things keep triggering me? I've the tools to put in place but they just don't seem to be working. 

2. I'm currently completing DBT for the second time and am still finding it difficult to get past the feelings of being judge and looking stupid. I understand group is a safe place and non judgmental but I can't seem to get past these thoughts and sitting with the uncomfortable emotions that arise when I do participate. These feelings will also extend into individual sessions when I am not feeling well or an incident has occurred that triggers my negative self thoughts. Obviously I do put in place some distressed tolerance techniques and try to challenge these negative thoughts but I was wondering if you had any other tips and tricks? The therapist at the clinic have reported to my psychiatrist that they don't know what they can do more to help when I present like this as I find it hard to even accept help when I don't believe I deserve it. I have the strong belief that other people are more deserving and I'm just wasting everyones time and being dramatic when they do attempt to help. I have no idea what they could do as I've never really had external support or allowed this to happen before. I just feel like I am wasting the opportunity again because of the negative beliefs I have about myself. 

3. I was wondering what to do if you're put in a position where a doctor or a nurse accuses you of being attention seeking/using attention seeking behavior that you don't see as being attention seeking, like when you're really struggling in inpatient and give up something you feel you can't be safe with or when you ask for help multiple times because you need the extra support and they accuse you of being attention seeking because of it. How can we handle being in a situation like that where we still have to interact with those people on a regular basis if they're a part of our treatment team?