Dear Fushiafairy,
When I looked at this horary chart I got a certain feeling which showed me the current situation you are in, what you are feeling etc.
The Ascendant is early, showing probably that you still are waiting for the results of some tests. The full 6th house indeed is an indication that we are seeing a person here who is not well. The reason can be allergy, especially when you mention wheat products, but I get another feeling.
You see that Sun, ruler of the 5th, Saturn, ruler of your 10th of career/social surroundings, your future, Mercury, ruler of the 6th and Venus, ruler of all these planets AND your Ascendant.
Venus is in a critical degree at 29° and as Mr. Farr mentioned, about to enter Scorpio, her detriment.
I use intercepted houses, even in horary and as you can see, all of these planets are intercepted.
Then we see Mars in your 5th in Leo, so this Mars is also ruled by that weak Sun in the 6th. The 5th house has to do with children and sexual relationships (in horary astr.). Mars is leaving a square to your Ascendant, and then Jupiter (who rules your 8th, the house representing the emotional support of a spouse or others in a relationship). This could have been about 8 month ago (8° counting from the Asc.) which makes me think that around that time something, to do with a relationship (I dont know if you are married or are/was in a relationship) or to do with a child or a sexual matter as well as maybe a death (Jupiter, ruler of 8) of someone, could have upset you in such a way that you became ill. "Something is itching you" and you cannot let it go (what happened) because the planets are intercepted and intercepted planets have difficulty in releasing their energy.
It can also have something to do with a legal matter, other people's money (inheritance). Money you thought would come to you was blocked by someone else (Mars, ruler of 7th) (Jupiter retro and Mars who squared Jupiter).
Your selfworth or finances could be affected (Mercury ruling also the 2nd) but Mercury is not in too bad a situation as it is in it's own house and term at 22°Libra.
What I think is that there is a lot of pent-up anger (showed by Mars who has been in square with your Ascendant ) which needs to be released and things to be talked out.
Maybe I am totally wrong here, but I would very much like to know in how far I am wrong (or who knows, right).
Hope this shed some light on your problem. Somehow I dont feel it is caused by an allergy.
All the best, Starlink