Both the molecules are SNRI - Serotonin Norepinephrine reuptake inhibitor. Because of its action on Norepinephrine, there is issue of raised Blood pressure, especially one having a pre existing Hypertension needs to have cautious use or regular monitoring.
Next Steps
Firstly, if there is response to treatment, and the BP gets controlled within a week naturally, nothing to worry, u may continue the dose prescribed. Sometimes body takes time to readjust to any molecule and create homeostasis.
Secondly if you aren’t able to tolerate the dose given, change of molecule will be necessary.
Thirdly review if prior doses of SSRI becomes mandatory to review lack of response.
Fourthly there could be slight readjustment of anti hypertension medication to reduce BP if good response is seen with SNRI, but that should be only time being and not for long term maintenance as your body will get tuned to new doses in say 2-3 weeks.
Last option is to start low dose and go slow in building the dose of SNRI.
You should consult your psychiatrist prior making any changes.