I want to go trekking in Nepal but I have a strong fear of heights and cannot tolerate sheer slopes. What would you suggest?

Over the years I have hiked most of the trekking routes in Nepal and, crucially for your question, I also get very bad vertigo – I don't even feel comfortable going up a small step ladder!

But, I can say that for the vast majority of Nepal treks you don't need to worry too much about having a fear of heights. Generally speaking on the (non-mountaineering) routes you'll be following pathways along hillsides and valleys rather than navigating sheer drops.

The exceptions you might want to avoid are the Tsum Valley Trek which has some decidedly airy sections, a couple of very, very short bits of trail on the eastern side of the Upper Mustang Valley (but really this is only a few metres) and perhaps the section over the landslide zone on the Tilcho Lake Trail. The Manaslu Trek trail is fine but there are a couple of stretches on the way up the valley where you do start to become a little aware of the nearby drop, but it's not enough of a sensation to really put you off.

I have done all the above with vertigo, but if you have it very bad they're the only ones I'd specifically avoid. I think you'll be fine pretty much everywhere else.