I experienced very low blood pressure and fainting after my treatment for lymphoma. The docs thought it was mostly dehydration and encouraged me to eat salty foods and drink more water. It did pass though as I recovered from that treatment and put weight back on. My electrolytes were constantly out of whack.

Stage IV SCC lt lateral tongue, surgery 5/19/08 (partial gloss/upper neck dissection left side/radial free flap reconstruction) IMRT w/weekly Cisplatin & Erbitux 6/30/08, PEG 1 6/12/08 - out 7/14 (in abdominal wall, not stomach), PEG 2 7/23/08 - out 11/20/08, Tx done 8/18/08
Second SCC tumor, Stage 1, rt mobile tongue, removed 10/18/2016, right neck dissection 12/9/2016
Third SCC tumor, diagnosed, 4/19/2108, rt submandibular mass, HPV-, IMRT w/ weekly Cisplatin, 5/9 - 6/25/2018, PEG 3 5/31/2018