Grrrrr what a bunch of useless dickheads!!!!
I wouldn't give up though hun, he wanted you to have those scans for a good reason. You know yourself how crappy you've been feeling even with being off work, it isn't worth the risk to just let it go.
I would also chase the cardiologist referral too, again you were referred for a good reason, so dont give up.
I know its a pain in the arse and it must be even more frustrating when you work for the NHS yourself but getting treated like this.
I really hope you get somewhere soon xxx