Wow, sounds like you had an intense time. Yep, the Goenka courses are full-on, almost any other retreat will be easier and more relaxed pace. But, saying that, pretty much all meditation courses involve long hours of meditation. Some may just have 7 or 8 hours, instead of the 10 or 11 of the Goenka ones.
Don't feel too bad about having to leave. I ran away in the middle of my second 10-day course! And a few years later I came back and tried again, and finished successfully.
One good thing that came out of this for you, is that now you know your mind is unruly, out of control. It's a wild animal. Most people don't ever realise that, they think they're the boss, HA!
I see you are in Yorkshire... I don't know of any particular retreat centres near you, but the Ajahn Chah monasteries run very good meditation courses, (mostly by donation too) and there are quite a few monasteries in the UK. You'd need to contact them by email... http://forestsangha.org/monasteries/
They don't have a convenient centralised website listing course dates, etc.
They have monks running the retreats, so they try to work through problems and tailor the method to fit you, instead of presenting just one way like the Goenka people do. Goenka's Vipassana is great, and it suits a lot of people perfectly, but there are just so many people going through their beginners courses that there's no flexibility to change the standardised technique to fit an individual.
Good luck and best wishes!
Oh, and if you are still feeling weird and turbulent today, I recommend eating a lot of heavy food, and maybe doing something really physical, to bring you back down from whatever headspace the last three days put you in.