When it comes to veteran's benefits, if you're not feeling great, make sure to visit sick call. If you end up with a chit from medical, keep a copy for yourself and also get a record of the visit from the records office as soon as you can. You never know, what seems like just hayfever could be something more, like allergic rhinitis or sinusitis. That chit or record could be the key for linking it to a service-connected disability later on.
After you've been to see the doc, try to give it your all when you get back to work, like 110%, so you can make up for the perceived lost time from your superiors and peers.