I hope you’ve come past this now.

My sister in law was diagnosed last year and have accompanied her on some trips for her medical visits etc and she and we are all being positive and supportive . Probably you are just feeling anxious and fearful which is normal feeling . Maybe talk to a good doctor and counsellor for relief .

Sorry to hear this news about your sister; wishing her well with her treatment. Cancer impacts on everyone in a family and the shock and the feelings are real. I would suggest you seek some counselling to discuss your feelings and also a visit to your GP to address your own concerns. Also; joining a support group with your sister may be a good idea too.

I think it’s probably just shock and trauma… But if you feel the same in a few weeks, you should probably talk to a professional.

I’m sorry to hear your sister has cancer. Sounds like you will be a great support for her.
Is it possible that her diagnosis has made you feel like you shouldn’t enjoy yourself?
Good idea to get checked by the doctor