Hi ang.
Had a similar question asked about Lisinopril recently. Here is some information about the Drug:
LISINOPRIL
Side-effects less commonly tachycardia, palpitation, cerebrovascular accident, myocardial infarction, Raynaud’s syndrome, confusion, mood changes,
vertigo, sleep disturbances, asthenia, impotence; rarely dry mouth, gynaecomastia, alopecia, psoriasis; very rarely allergic alveolitis, pulmonary infiltrates, profuse sweating, pemphigus, Stevens-Johnson syndrome, and toxic epidermal necrolysis
Whatever problems you have should be discussed with your GP before starting or reducing medication.
This is a link to the original answer. Take a look,
viewtopic.php?f=18&t=7436&p=67870&hilit=Lisinopril#p67668
it may be related as you are also on Metformin I see. Do you know what your Bg level is when this happens ?
Hope this helps.
Ken.