I would give them a call anyway... cross fingers you get someone a little more sympathetic this time... maybe the mids would have some ideas on how to slow them?

Do they come on when you do anything in particulare? For instance certain movements.... I don't really have any idea on how to slow them, the only thing I can think of is if you are moving around when they start, then rest... if they start when you are resting then move! not very helpful sorry

But what I really think is that you shouldn't let one snotty midwife put you off calling. If you have a genuine concern (and you do) then you have every right to call or go in & get advice.
It doesn't have to be all about 'is bub ok' it can also be 'help me cope with this!' - kwim?

(and after all that, just think that your body is doing an awesome job preparing for birth, you may not appreciate it now but maybe in a few weeks time...)

Good luck