LJB,
Medications and therapy can be be a tough balance. For me, it was a matter of finding a medication that provided stability in terms of how "low" I get, but not so much that I get cut off from my feelings as (unfortunately
) having our feelings can be pretty important to healing.
I do not think you should feel guilty, you are only trying to keep yourself safe which is healthy and normal thing that human beings do. But considering your Ts reaction, it is understandable that you are questioning whether using medication for sessions is the most productive thing to do. I would discuss how you are feeling about this with your T and express your fears. I know that a crucial part of therapy for me has been to go towards the feelings that have felt like they would overwhelm and destroy me but with my T there would stay with me and provide support to "contain" the feelings so I was not alone with them and was not overwhelmed with them. For really difficult feelings, at least part of the problem was that I had been left alone to deal with them, so it was very reparative to not be left alone with them.
SO I am wondering if an open discussion with your therapist that you take the meds because you are afraid of freaking out would be helpful? It may be that if your therapist can reassure you that he can handle you freaking out and help you, then you can feel more safe (it will still be scary I know) not taking meds for the session. Then if you do have a session without meds and it turns out it really is overwhelming then you can return to using them without guilt, knowning that right now that support is needed. On the other hand, if it works better, than you have removed something you no longer need so you can progress.
There is no "right" or "wrong" her LJB, just whatever you find most effective for your healing. Medications are just another tool in the toolbox.
AG