Hi Grace,
In addition to what has been offered, my feelings is that it does not represent a literal Tsunami and the loose skin you noticed which you saw as having lost weight was symbolic for not having "thick skin" meaning you are sensitive and/or vulnerable to a situation coming.
Thick skin: (have) a thick skin able to ignore personal criticism.
The wave coming from the opposite side of the ocean from the East may be showing you that it is not a
literal Tsunami... but could be spiritual, rising trouble and/or emotions which seem overwhelming. Could be coming from those who you do not expect... do not allow the situation or others [the ones who you did not like their banter] to cause you to doubt, or doubt yourself (James 1:2-8 ), nor get caught up in the situation.
He is faithful to see you through whatever trial comes along! Just keep running the good race looking to the author and finisher of faith! You were strong, until their banter and then the overwhelming wave came. Seeing beforehand, you can avoid being overcome by the seemingly huge wave... and instead be overcome with the peace and Holy Spirit.
I think the dream is to warn you of a situation coming so that you can be prepared for it when time comes... so you are able to see the situation in a different light looking to and trusting in Him through it. He will protect you, keep and guide you, remain strong in Him and in peace and know you are victorious in Him!
Just as I have been recently reminded in Isaiah 59:
Isaiah 59:19 So shall they fear The name of the LORD from the west, And His glory from the rising of the sun [East}] When the enemy comes in like a flood, The Spirit of the LORD will lift up a standard against him.
Good will come out of a seemingly not good situation, like in Romans 8:28.
Praying the Lord strengthens, encourages and blesses the works of your hands... know that He is always faithful and will not leave or forsake us!!
I hope this helps, toss out what does not witness to you.