I need to leave don't I?

[dryasaboner]

Been having troubles with DH recently he's very cold and unemotional. He will help practically with lots of things but he's awful emotionally
Anyway I have Crohn's disease and am in the middle of a nasty flare up. I was discussing a new medication my consultant would like to try me on and said one of the side effects is hair loss. He looked utterly appalled . He literally couldn't hide the revulsion on his face.
I feel too old to start again now at 55

Op you need to discuss this with your dh. Go somewhere public and have a calm talk. You could be misinterpreting revulsion as anxiety and horror for you, on your behalf. Or, if you can establish he is repulsed, you need to talk about it. Ask him how he would expect you to behave and feel if he lost his hair through chemo treatment for example. He may be cold and unemotional, or he may be overwhelmed or depressed. One of my DC is going through tests for a chronic illness and it is awful for them but it is also very tough on everyone else in the family. Good luck

When I was first diagnosed he raised concerns that it would likely be the end of anal

Yes, you need to leave him. As soon as humanly possible.