That's just it. I've travelled on th einderground on and off for years and years with no issue at all. Suddently when on the "up" escalator a few months ago, i staet4d to feel dizzy, and like i was going to fall and had to keep staring at my feet and was clinging for dear life to the handrail - I honestly wondered if i'd make it to the top. I tried to disregard it and put it down to tiredness, but then a few days ago the same thing happened again. I'm ok on the "down" escalator but the "up" one has now become a big issue. I've got another trip to london in a few weeks and i'm panicking about what to do...