If you are going down the conventional drug path, as kjring says it is worth experimenting with different Preventers (generally brown or orange). There are several, different people respond differently to them. The whole idea is not to have to use the Reliever (generally green or blue). If you are needing your reliever more often, that is a warnining sign that your preventive medication needs reviewing.
Preventers prevent inflammation (and airways tightening) from occurring in the first place. This is a good idea because inflammation can lead to airways damage, which makes asthma more difficult to control. If inflammation can be prevented then it shouldn't lead to so much damage.
It's worth looking into house dust, dairy etc if you think this may be a trigger - however, not all asthma is allergic and may not respond to antihistamines. My daughter used to be hospitalised regularly with asthma, but tests showed she isn't allergic to anything, her airways just over-react to viral infections. There have been some particularly nasty viruses around over the last few years, so that's possibly what's triggering yours? She's now on a long-term antibiotic - although in theory antibiotics have no effect on viruses, this particular one appears to have a preventative effect. She's now stayed out of hospital for 15 months, which is a record.