Welcome and thanks for posting your query to HCM.
I can understand your concern towards the long term problem from which you are suffering from. According to your history it is since 8 weeks that you have the swelling over left side of waist.
The very first and important information to provide you is that - shingles
occurs only one time in life. It begins as multiple blisters on one side of body and specifically at one region only. The blisters remain for a period of around 7-14 days and then forms scab which fal off in next 2 weeks.
So if your symptoms matches the above thing then it was shingles only. The pain and discomfort remains for a long period of time even up to multiple months.
If your symptoms are not matching above then you need to take second opinion
and accordingly go for the investigations suggested by the doctor. It is not a good choice to g for scan by yourself without a expert opinion.
Hope these informations are helpful.
"Wish you good health"
Dr Sanjay Kumar Kanodia
MD (Dermatology & STDs)