I have sinus pain and a but of a dry throat and body pain more in neck and shoulders. and a slight headache. slight lower back. started feeling this since last night. should i get tested ?

Yes, get tested: It is important that exactly people like you get tested, so that we can learn of people with just minor "achy symptoms " like yours may actually have a mild case of Covid19. It also let's you know whether you need to keep a full quarantine. You are absolutely correct that it may be just a nothing, but combine the fact you were exposed with mild symptoms-that equals get tested!