I'm on 3 monthly b12 with Gp . Only well for the middle month. It takes a few weeks for the injected 1mg to kick in , and the month before it's due again to wind down like a clock. Bit worrying my family witnessed me passing out 2 days ago. Did a home Bp and it was 106/61 a little while after the episode. I normally have highish Bp 145/86. I'm on the running down time as b12 is due in 3 weeks. . I looked on line and anaemia can lower Bp .any suggestions?