Hi Maz - welcome back
I know you just want experience but sometimes what was OK for someone else may not be right for you and vice versa.
If you didn't go through a Dr I think it's wise to do that.
I know the NHS can be difficult to negotiate but that doesn't change the fact professional medical advice is the way to go, especially if you're on other meds or have other health problems. Not everything is suitable for everyone.
If it was prescribed for you, I'd check with the prescribing physician and explain your fear.