So it appears you're in a rough predicament. I think I have no choice but to say that the best option for you would be to make a trip to the emergency room.
However, believe it or not I've been in a similar situation more than once in my life, and I would do one of the following, if not all:
1. Search every nook and cranny of the house for an inhaler, and pray I found one.
2. Relax. Do relaxation exercises. Try to sleep. Sometimes this helps.
3. Drink coffee. It is a mild bronchodilator and may help. It was often recommended in days of old.
4. Try something for allergies, like Claritin or Drixorol or Benadryl to attempt to resolve the allergy symptoms.
5. Diaphragmatic breathing. Breath with your stomach rather than your chest wall. Actually, this is part of #2 above.
Do not, however, use over the counter asthma medicines, especially the inhalers.
Ideally, however, you should get your lungs to the ER, and know you'd be treated with respect. And in the future, make sure you have your medicine handy. Never let it run out.