Hello @Rammie18 and everyone,
I’m new to this group but I’ve read almost all of the posts in this long thread (posted from June 2023 until this week).
I’ve been diagnosed with Polycythaemia vera (PV) (JAK2 positive) in March 2022 when I was 58. My platelets, white blood count, haemoglobin and hematocrit were off the charts.
After that, for 12 months, I had venesections and low-dose aspirin. I took Apixaban only when I was travelling on a long-hour flight.
In the first month, I had weekly venesection, and then after that bi-weekly, and then monthly and then bi-monthly.
After all blood parameters near the normal range, inJuly 2023 I was prescribed with Peg-interferon self-administered injection at 0.45 mcg/week.
The side effects of the first three months was awful - lower back pain, foggy brain and mood swing. I broke down a couple of times for about 10-15 minutes, cried and sobbing, but after that the emotion faded away. I still have venesection every 2 months.
Occasionally, I felt knocked down, like a robot lose its power. I think my blood sugar was low, so I drink tea with sugar and had cookies or chocolate bar (always had one in my bag). After 30 minutes usually I would be back to normal.
After 6 months, the dose increased to 0.90 mcg/week. All blood parameters are now within the normal range. My Haematologist had cancelled my last venesection appointment.
All is well until my last jab a couple of weeks ago. My blood pressure went off the chart again, within 149/92 to 166/98. I never had this record before.
The nurse held my peg-interferons and told me to talk to my GP (useless) and left me without any options to deal with my Polycythaemia vera (PV) and conditions. I was upset when the nurse decided to stop my Peg-interferon and sent me to A&E which increased my blood pressure (up to 182/98). I’m waiting for my next consultation with my Haematologist to decide what to do next.
After reading some of the posts (a lot of very useful information! Thank you all for sharing!), I think I will have to continue the venesection but carefully checked my Haemoglobin level at home.
I just want to share my experience with Peg-interferon. And as you said (and others too) that every one of us reacted differently to Polycythaemia vera (PV) medication/interventions.
For young people prescribed with Peg-interferons, watch out for your first three months’ side effects. Stay positive, walk outdoors, do meditations or yoga and try to control your mood swing.
Take care everyone!
Hope you have a nice Easter break 
Cheers,
Ismawati64