Hello.
Thank you for asking at HCM.
I went through your history and would like to make suggestions for you as follows:
1. Yes, Philodendron is considered an allergic plant. Any many parts of the plants are allergic.
2. Pollens of the plant can cause nose, respiratory and
eye allergies, upon ingestion of it's juice, one can get stomach upsets and upon touching the plant, one can get skin allergies.
3. Your observation may be correct, congestion, eye symptoms may well be due to pollens of the plant. I am not sure about
diarrhea but it may also be possible as well.
4. To confirm, I would suggest you
allergy testing for pollens of the plant.
If this is not possible, I would suggest you to keep plant out of house for a few weeks (8-12 weeks), if your symptoms improve, you could think it was due to allergy to the pollens. (After removal of plant from home, it takes a feww weeks to actually clear pollens from home, that's why it takes longer)
5. Till you have symptoms, I would suggest you to take regular
montelukast and
levocetirizine.
Hope above suggestions will be helpful to you.
Should you have any further query, please feel free to ask at HCM.
Wish you the best of the health.
Thank you & Regards.