I know how hard it is to not think about the OP and WAW together, but I really have found it helpful to use the "STOP sign" technique, which I read about either in Divorce Remedy or on these boards.
Whenever you catch yourself worrying or thinking about your W and OP, visualize a large and bright red STOP sign. Tell yourself to stop thinking those thoughts and then physically move to a different position. If you were sitting, stand up and walk to another room. If you are lying on a Mexican beach, get up and jump into the ocean, and shift your mind to the present moment. Find activities that demand some amount of focus and that are calming. For me it is doing yoga or working with clay in my ceramic studio.
If hyperventilation becomes a problem, learning some breathwork in a meditation or yoga class might be really beneficial.
It can be difficult to develop mental discipline, but it is so helpful in the long run.
I wish you peace, and hope that you have a restful time in Mexico.
LG
Me 46 WAW 45 M 21 yrs
WAW: "I need to be alone" 12/06 W moves out 3/07 Mediation finalized 08/08