The difference between a DNA test for genealogy and a WGS (Whole Genome Sequencing) test is that the test for genealogy obtains values for about 700,000 SNPs (Single Nuleotide Polymorphisms), whereas the WGS obtains the values for all 3 billion positions in your genome. For genealogy purposes, the 700,000 are enough, because they are picked from among the 10 million or so SNPs, which are positions where the values in humans vary. Those 700,000 SNPs are compared against the same SNPs in other people to see to whom you match and whom you don't. Trying to compare 3 billion positions, where most are the same just adds extra processing with no significant improvement for matching people. So for genealogical purposes, there is no reason to get a WGS test.
Health issues are a different matter. If what you are really looking for is personal health information from your DNA (which I gather from your handle: SEID Sufferer), then you were right to go first with 23andMe. Among the 700,000 or so SNPs they test are ones they specially pick for health purposes. Their reports may provide some information on the ailments that might be of interest to you. You can then download the raw data from 23andMe and upload that to Promethease which for a small fee of $10 to $20, will provide you with additional health information and possibly include the ailments you are interested in.
I did a WGS with Dante labs last fall. What they do that's different is that they will do the WGS test and provide you with health reports on ailments that you request information on. The reports they provide on each ailment is very technical (so much so, that I couldn't interpret mine, other than my DNA was negative for one and positive for the other of the two minor issues that I had requested). During Rare Disease Month (Feb 2019), they are offering several detailed additional reports. These reports contain much more than the 23andMe health information, and are better organized than the Promethease information. If you are interested in your genetic health, or in a specific ailment, and have the ability to interpret it correctly, then Dante's test likely will be worth the cost of the test to you.