I recently did both. The manometry was uncomfortable, but doable. Just try to relax and remember that it will be over soon. I had troubles in that I would swallow a little before he put the water in my mouth, and then I would have to wait for that swallow to pass before continuing. So really pay attention and focus on only swallowing once to make it go by quicker.
My pH probe was not wireless, so it was annoying to wear all day. Also, I did find the wire aggravating on my throat when swallowing, but I've had quite a bit of throat pain lately anyway, so I was probably more sensitive than others.
I hope your tests go well! Theyll be over soon, and the info gained will make them worthwhile. Good luck!