Hello hope you be fine,,,lets discuss your issues one by one First you are weak dizzy and nausea,,,these three are interconnected when you are nauseated you dont eat ,when you dont eat you have lack of energy and you feel dizzy ,,,now cure dear take antiemetics ,take food after every two hours no matter even if you vomit,take juices Second your rash and itch after secont trimester your skin goes very dry ,frizzy it itches and irritate you,,remedy oil yourself ,,avoid particular food which cause it loke few people have this bez of dry fruts,,, Lastly your dizziness might be because of anemia get your full blood count done again ,,,yes check your thyroid levels also because increased nausea with fall h.b levels are sometimes causeby thyroid dysfunction in pregnency Stay blessed