Fainting spells

Hello Everyone, I’m four years on from having 12 months of herceptin . I have recently had blackouts and my doctor mentioned because I had herceptin there may be a link . Has anyone else experienced a similar thing ? ,Many thanks in advance .

Loss of time and focus but not fainting; but yes sudden ‘almost’ collapse out of blue, like those tall wind socks with a fan in front of stores, but that has been from the very first chemo/herceptin dose which got worse through the entire year of herceptin and never got better after last herceptin (dec 2014).  Almost like some kid sneaks behind your knees and bumps them both to watch you fall, but catch yourself just before hitting the ground.  Maybe a chest strap from a sports store can track BP/BPM to see if related.  Also see a neurologist please.