Backache headache and allergies

Well I'm currently 15 weeks pregnant🙌,but for a couple of weeks now I've been doing nothing but sneezing up a storm. I've also had horrid headache's which I think might be sinus stuff. Never had allergies but now I'm like wtf-_-. Did anyone take any medicine or home remedies to help with sinus stuff.Plus ladies do you all have horrible back pain I feel like an old woman.