itching

Sa
I'm 39w 6d and cannot stop scratching my bump. It's so itchy it's driving me crazy! Now my arms and legs have started too! I have an appointment with the midwife tomorrow anyways, but wondering if there's any creams etc. recommended? (Live in the U.K.) I've tried Aloe Vera cream, nappy rash cream etc. but nothing is fully soothing it. It's 02:50 and I'm wide awake because my arms, legs and bumps are itching but I'm trying so hard not to scratch! Help!