Sadly we can't give any answers only reasurance and support...
Try not to worry about the scan, not easy I know but it's part of your care team process of resolving what is going on, so you could very well find the anwser is a simple one..
As to you relationship, well your partner handles your diabetes so there is a good chance that this will continue, one never knows so try not to worry about this...
I hope all goes well with your scan and it gives a simple answer and resolves what's going on..