Just in case anyone else is suffering as I did - let me state the obvious that no one told me till late in the day - you don't have to drink Fortisip through the straw!
Yeah I know dumb-ass me - I struggled like hell to get the stuff down through the straw - and it was hell. Then I thought I could squeeze it in with a syringe - which helped for a while and is another tip if you get desperate as I did - then joy of joys someone pointed out I could just drink it from a glass. It seems easier to get down drunk from a glass!
I hope this is off some use to someone else if ony to highlight my stupidity which led to pointless panic and some pain - as my tongue trying to suck anything up a straw was hell!
So there you are, a little tip that is so obvious but there must be others out there who could do with the obvious advice!
I also put off having the "shakes" linger than I should cause I thought they would be hard to get down but they AREN'T THAT BAD - in fact once I got onto them I found them easier to drink - if obviously more bulky to get down.
(I put some ice cream in with the shakes - it does improve them)
I'm saying all this as though I am off Fortispi and the shakes but I am not. Not surewhen that day will come - I keep experimenting niow with little tastes but no real joy.
All the very best and I hope I am in more pain than you are!