Hi Doctor.. About 5 Days Ago I Started To Come

Hi doctor.. About 5 days ago I started to come up in painful red some yellowish in the centre spots. Mainly on back of neck side of upper arms and legs. I went to see a pharmacist and he said he thinks it was chicken pox! I’m not so sure now, I went out in the garden for 20 mins or so and the sun seems to have agravated it. I’ve never had problems in the sun before. I’ve been taking Amitriptyline for about 4.5 weeks now 10mg and was wondering if this could be a side effect?
Thanks
Danny