Often after surgery people have good pressure control for many, many years. Trabs may last a long time. Three meds are a lot when you have to take them day in and day out. But, if they do the job, it's worth it. Cold and allergy medicines can trigger an attack of angle-closure glaucoma in those who are at risk.
Steroids can increase eye pressure gradually in some people, but that's an open angle type glaucoma.
Sometimes the meds can affect the sinuses with similar sensations. It might be wise to have it checked, though. My doctors told me not to use antihistamines. Sometimes the doctor can check the angle before and then after antihistamines to see if the angle changes. The anti-histamine effect is temporary, but could be serious if it triggered an attack.