I'm due to visit my colleagues in our London office this week. I'm based up north, but most of the team are based in the London office. I am the newest and most junior member of the team, for context. My manager said work would be happy to reimburse my train fare and hotel stay to come down and visit the team which I gladly accepted the offer of. I am due to go to the office on Tuesday. I don't have any meetings, it would just be me meeting the team and working from the London office. It's a 4 hour journey there, and 4 hour journey back.
The last few days I have been feeling really overwhelmed and worried about the visit. I have been struggling with some medication side effects which have me feeling dizzy and vomiting. I've been working from home with a sick bowl next to me the last few days, and I can't seem to eat anything beyond dry toast without being sick. I have anxiety which most of the time I have learnt to be able to just get on with things, but the thought of travelling 4 hours away and meeting everyone feels really overwhelming and I feel really tearful about it which isn't like me. I've had a really rubbish week due to lots of things happening at once and I just don't feel like myself at all.
Do you think I could ask my manager if I can visit a different week instead or would it look bad? I'm still in my probation so I don't want to give a bad impression.