I appreciate your query.
Since you have had a tubal ligation
and a negative HCG pregnancy test too, I think we can safely rule out pregnancy in your case.
However, the rest of your symptoms are quite vague.
Headaches, distended abdomen, fatigue, dizziness
, swelling etc, plus an increase of your allergy symptoms - it is a cluster of vague and unrelated symptoms.
You require further investigations to rule out any pathological condition.
Please go for a complete ultrasound
of your whole abdomen , plus pelvis, which will definitely rule out a pregnancy, as well as point the cause of your abdominal distension.
Kindly get your weight and Blood pressure , as well as eye check up done to rule out cause of headache.
Get your complete blood count
, viral markers ( HIV, HBsAg, HCV
Please get your liver and kidney function tests done.
You need to consult a Rheumatologist
/ Allergy specialist to suggest further tests, after examining you for the cause of swelling and allergy.
Lastly, if all the reports are normal, but the symptoms persist, please go for a cardiac evaluation also.
I hope this helped you.