Your problem may be related to an imbalance between your Sodium to the amount of Potassium in your Lymphatic system !
Too much Potassium to the the amount of Natural Sodium is what the problem may be !
Thus you may need more Kelp(Natural Sodium) which has been grown in colder water to provide this !
If the kelp is grown in warmer waters, then it may not Correct this problem !
But since you say you are doing a little better than you used to, this may mean that you are getting a litle more Sodium than you used to get from your Diet !
So it is either from the Kelp or from some other change you may have made ?
Because when you get the Balance of the ratios correct, you will not be cold anymore during cold weather, of course you will still need suitable clothes !