Things have been busy for you lately and you should relax today, even if that means saying no to invitations.
Life has been high paced for you lately and you need to take it slowly and relax. This is not always easy, but do not feel pressured into socialising and taking part in activities when you do not feel up to it. Do not be afraid to say no to people, your real friends will understand and will be more concerned with your welfare than with you rejecting their invitations. Put yourself first.