chronic illness flare

Nausea… Go away!!! I just want sleep!!! Having a GP and POTS and EDS flare!!! What do you do for breakthrough nausea? Already took my orally decentigrating tablet, and can’t take another one for 5 more hours!! My BP is 88/48 and when I stand, my HR goes from 79 to 128. Ugh!!! How do you get your docs to give you IV Zofran? Ray