Sickness in pregnancy

So i'm now 17 weeks and 6 days and my previous happiness about no sickness have gone. 
I have been sick every single day for the last couple of weeks, no nausea like morning sickness just the sudden urge to throw up there and then and i'm then left exhausted.  Its driving me mad at the moment and i think the hot weather has been making it worse as i need to keep up my fluids. 
Its not like morning sickness so i'm not sure where it could have come from, maybe linked with heartburn?

Tomorrow Seb has a hospital appointment which involves an hour long bus journey to get there and then another hour back, please don't let me be sick!

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