advice please :)

Hi everyone, I'm currently 8+6 with my second baby, this pregnancy has been completely different to my last, I've been having a lot of cramping for weeks, however the past week or so I have been having stabbing pains on my lower left side of my abdomen, I've been feeling really faint and dizzy & today I feel I'm getting breathless easier, and for the past two days I've been getting shooting pains in my lower left arm! Any ideas on what this could be? I'm not due to see the midwife until next week and my scan isn't for another 4 weeks & I'm starting to get concerned.