Hello @RenataW, Welcome to the group none of us eve thought we'd have a need to join.
As a counsellor you can sit back and think clearly for your client but when it is you being affected the emotions get in the way so don't feel that you are a failure. As we all say, take things one day at a time and don't try to think or plan ahead as you may be looking down the wrong path. Things become clearer and fall into place.
As @Blossom1961 said we have probably all had a melt-down at some stage. I was doing great until the surgeon left and the nurse patted my knee, saying "you are taking this so well". Ha Ha.
As long as you trust your medico and feel they are communicating with you then you are ahead. You are getting the whole gambit of tests which some of us were not even offered so that is good.
Do you have family and friends who can be a support to you ? Take someone with you to appointments as they are a second pair of ears - again, your emotions can get in the way and you are contemplating one comment when the specialist is onto the next. You can also ask to record the appointment so you can listen later.
All the best. Stay in touch and remember that we are here for you - no question is too small or too silly.