@Siewli
Unfortunately you can do little until you get the results of your tests and know what is what. All those investigations are sensible and practical, everyone needs to know but that doesn’t make it any easier to endure. What you can do sounds counterintuitive but it’s also practical - look after yourself. If the tests turn up nothing, that’s good news. If they turn up something, then your team can work on it as soon as possible. You need to be as strong and fit as you can be, so you can face these changes and get through treatment. Reach out to anyone who can provide some company and distraction while you wait. Best wishes.