Major life changes, like a car accident or winning the lottery, can “happen overnight”, but your adjustment period won’t. Try to visualise the stages of the change and imagine the end of the process, when you have adjusted to the new circumstances.
Some changes will be very unexpected. Accept it as a new chapter in your life; as a fresh opportunity to gain knowledge or experience in a new area, or a chance to discover new people, new places and new skills.
Change will happen. You may be, at least initially, resistant to these changes. You cannot always control either the changes or your initial hesitancy. You can control your larger response to the changes. To do so requires your active participation.
There is a difference between being patient and being passive. You can patiently accept change while at the same time actively pursuing strategies to get yourself used to the new circumstances, emotionally and otherwise.