Blood pressure after cladribine HCL and neulastata

Can't get bp up after successful hairy cell tx. Dx 1981 splenectomy. 2018 relapse-cladribine Great! April, 2025 relapse. Cladribine/neulasta Great- no fever. No pain. Feel good, BUT cannot get bp up over 90/40 (has gone down much lower usually 140/80 + micardis).
Feel ok, just dizzy and weak. Tried ER. 5 hours xray, elecCardiogram, bloods. Said all ok. Will get echocardiogram soon.
Any known connection between tx and low bp?
ps have long time benign left ventricular arrhythmia. Never been a problem.