Some sounds may seem loud to you and you may become exhausted after listening with your HA for a certain period of time.
If this is the case, try wearing your HA for only 2 hours per day and gradually work your way up (adding an hour each day).
Keep in mind that it will take your brain a little time to become used to the new sounds it is hearing, so don't give up if things sound strange at first. I don't know what your hearing loss is, but chances are that you will be hearing frequencies that you haven't heard in awhile or a long time. The sound of your voice may also sound different to you.
The longer you wear your HA, the easier it will be to acclimate to the new sounds you are hearing.
If you are unhappy with what you hear for any reason, be sure to tell your audi so he/she can make the proper adjustments to your HA.
You also might find it helpful to write a journal of what you like/dislike about the sound of your HA. (i.e. too shrill, too bassy, etc.) This journal will assist your audi in determining what adjustments/settings need to be changed. (My CI audi recommended I do this and it helped significantly by allowing us to achieve a good map.)
Finally, keep in mind that several adjustments may need to be made before you are happy with the way your HA sounds.
Good luck!