Yes you can request to go back to your previous insulin regime.
However, in your position, with what I know about basal bolus regime, I would persevere and demand my doses were reviewed. You should not be afraid to eat. It is affecting your mental (and maybe physical) health
Do you have the option to go on a DAFNE course? This would help you understand your insulin and learn to adjust it yourself.
If not, I recommend first doind a basal test. If you are injecting soany times a day but only eating one meal, it suggests to me your basal dose is incorrect.
Once that is sorted, you can work on your insulin to carb ratio. 1:10 is a common starting point but many of us vary from this. Plus, at different times of the day, we can have different levels of insulin sensitivity so the ratio can be different for different meals
It sounds as 8f your clinic are simplifying it too much for you and not giving yourself a chance to learn
Final thought, 8f DAFNE is not an option, there is an online version called Bertie.