As first aid with anxiety one can use drugs of benzodiazepine group, which serve as anxiety suppressors; of the most known are those with active substance of Alprazolam, Bromazepam, Clonazepam. One should bear in mind that, as all drugs with influence on brain chemical processes, these too have side effects, such as sleepiness, dizziness etc. As well benzodiazepines are - after specific period of time – addictive, and thus it is possible to stop using them only by gradual lowering of dosage.
For me personally was very helpful drug with Alprazolam. I've use it for one and half year. Then I considered it was enough and gradually stepped out of usage. But I have it always by hand. From time to time – in case of sleeping problems due to tinnitus – I use 0.25 mg and it reliably helps.