Lda worsens my Pots 2 days in

I'm currently 2 months into LDN now at 4.5mg and no significant inprovements or sideffects yet and started taking 0.25mg LDA two days ago and it significantly increaes my Pots and makes me feel a bit like i'm having a crash at least physically. I get trachycardy while sitting and when stretching and standing up and gravity feels like its double. Has anyone experienced this? Does it go away after some time or should i lower the dose or stop completely?