ferility testing through the NHS

Anni
Hi all,
We've recently been referred to the NHS fertility clinic, aside from the fact it was the worst experience I have ever had of the NHS, we are now feeling really lost and hopeless :( Ive been told I need to book myself in for a fertility scan, xray or key hole surgery to establish if are any issues. 
Has anyone been through this? I dont know which one I should do. The Dr gave us no advice, just a leaflet on each and gave me a number to call to book myself in. 
I would love to hear from anyone that has been through fertility testing with the NHS!